<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <script src="./js/vue.js"></script>
  <style type="text/css">
    .tab ul {
      overflow: hidden;
      padding: 0;
      margin: 0;
    }

    .tab ul li {
      box-sizing: border-box;
      padding: 0;
      float: left;
      width: 100px;
      height: 45px;
      line-height: 45px;
      list-style: none;
      text-align: center;
      border-top: 1px solid blue;
      border-right: 1px solid blue;
      cursor
    }

    .tab ul li:first-child {
      border-left: 1px solid blue;
    }

    .tab ul li.active {
      background-color: orange;
    }

    .tab div {
      width: 500px;
      height: 300px;
      display: none;
      text-align: center;
      font-size: 30px;
      line-height: 300px;
      border: 1px solid blue;
      border-top: 0px;
    }

    .tab div.current {
      display: block;
    }
  </style>
</head>

<body>

  <div id="app">

    <div class="tab">
      <ul>
        <li v-on:click='change(index)' :class='currentIndex==index? "active":""' :key='item.id' v-for='(item,index) in list' v-text='item.title'></li>
      </ul>
      <div :class='currentIndex==index? "current":""' :key='item.id' v-for='(item,index) in list' >
        <img :src='item.path'>
      </div>
      
    </div>

  </div>

  <script type="text/javascript">


    var vm = new Vue({
      el: '#app',
      data: {
        currentIndex:0, // 选项卡当前的所有
        list: [
          {
            id:1,
            title:'apple',
            path:'img/apple.png'
          },
          {
            id:2,
            title:'orange',
            path:'img/orange.png'
          },
          {
            id:3,
            title:'lemon',
            path:'img/lemon.png'
          }
        ]
      },
      methods: {

        change:function (index){
          // 在这里实现选项卡切换操作, 本质就是操作类名
          this.currentIndex = index;
          // 如何操作类名? 通过currentIndex来操作
        }
      }
    })

  </script>
</body>

</html>